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Nuclear absorption cross sections using medium modified nucleon-nucleon amplitudes.

R K Tripathi1, J W Wilson, F A Cucinotta

  • 1Hampton University, VA 23668, USA. rkt@hesb1.larc.nasa.gov

Nuclear Instruments & Methods in Physics Research. Section B, Beam Interactions with Materials and Atoms
|September 7, 2001
PubMed
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We reliably extracted in-medium nucleon-nucleon amplitudes from proton-nucleus reaction data. These findings provide simple energy-dependent expressions for colliding nuclei, showing excellent agreement with ion-nucleus absorption cross sections.

Area of Science:

  • Nuclear physics
  • High-energy physics
  • Quantum mechanics

Background:

  • Understanding nucleon-nucleon interactions within nuclear matter is crucial for nuclear structure and reactions.
  • Previous models often rely on theoretical approximations for in-medium effects.

Purpose of the Study:

  • To extract reliable in-medium nucleon-nucleon amplitudes from experimental data.
  • To develop simple, energy-dependent expressions for these amplitudes applicable to various colliding nuclei.
  • To validate these expressions against experimental cross-section data.

Main Methods:

  • Analysis of existing proton-nucleus total reaction cross-section data.
  • Derivation of empirical expressions for in-medium nucleon-nucleon amplitudes.
  • Comparison of derived amplitudes with ion-nucleus absorption cross-section measurements.
Keywords:
NASA Discipline Radiation Health

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Main Results:

  • Reliable in-medium nucleon-nucleon amplitudes were successfully extracted.
  • A straightforward, energy-dependent formula for these amplitudes was established.
  • The derived expressions demonstrated excellent agreement with ion-nucleus absorption cross-section data.

Conclusions:

  • The study provides a data-driven method for determining in-medium nucleon-nucleon interactions.
  • The developed expressions offer a practical tool for theoretical calculations in nuclear reactions.
  • Experimental validation confirms the accuracy and applicability of the derived amplitudes.